# author destiny1
# Date: 2023/8/9 19:53
from greenlet import greenlet
import time
def test1():
    while True:
        print("---A--")
        gr2.switch()
        time.sleep(0.5)
def test2():
    while True:
        print("---B--")
        gr1.switch()
        time.sleep(0.5)
gr1 = greenlet(test1)
gr2 = greenlet(test2)
#切换到 gr1 中运行
gr1.switch()